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a²√3/4 = 9√3
a²/4 = 9
a²=9*4
a²=36
a=6 cm
2r=6 cm
r=3 cm
h=a√3/2
h=6√3/2 = 3√3 cm
V=1/3*πr²*h
V=1/3 *π *3² *3√3
V=9√3π cm²